How to connect polypropylene pipes with plastic and metal pipes. Methods of how to connect polypropylene pipes and the sequence of work How to make a detachable connection of polypropylene pipes

Every year, more and more often, the design of plumbing and heating systems in apartments and private houses is carried out using poly propylene pipes. Modern technologies their manufacture allows you to create durable communications that are not subject to corrosion. At the same time, the main task facing the builder is to create a high-quality connection of pipes with each other, since the reliability of communication systems will depend on this. Therefore, the main methods of joining polypropylene products will be discussed below.

Figure 1. Special fittings have a cut thread on one side and a coupling for soldering on the other.

Methods for connecting polypropylene pipes

Installation plastic pipes It is done quite easily and quickly, so that even a person without special training can cope with this work. Connections can be detachable (threaded) or permanent. In the first case, special threaded fittings are used, and you won’t be able to cut the thread yourself. Therefore, to create a reliable connection, a sealant or Teflon tape is used.

Figure 2. Installation of polypropylene pipes using compression fittings.

Welding joints are stronger and more reliable, but their creation requires special equipment - a polypropylene welding machine. In turn, welding can be socket or butt. Each method has its positive and negative sides.

In most cases, thin-walled products are connected in a collapsible way. For the construction of heated floors, as well as for supplying cold water PN 10 pipes are widely used. In heating systems with low and high pressure, PN 16 products are used to supply water. Pipes with diameters PN 20 and PN 25 are recommended to be joined by welding.

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Dismountable connection of polypropylene products

To connect plastic products with metal elements (mixers, meters, etc.), special fittings are used, on one side of which there is a cut thread, and on the other - a coupling for soldering (Fig. 1). In this case, the thread can be either external or internal.

Installation of polypropylene pipes with steel using fittings is carried out as follows:

Figure 3. Flange connection diagram.

End metal product lubricated with oil or grease, after which threads are cut (internal or external). If the fitting has internal thread, then the pipe must have an external one, and vice versa.
Tow is wound around the thread and treated with silicone.
The fitting is screwed on and clamped with a wrench, but without applying excessive force, otherwise it may crack.
A polypropylene pipe is inserted into the other end of the fitting, after which it is soldered.

With the help of such fittings it is very convenient to create various bends and turns of communication systems. If you need to change the fitting configuration slightly, it should be heated to a temperature of about 135 °C.

Another type of dismountable installation of polypropylene pipes is their joining using compression fittings. They are easy to use and can be used to design both cold and hot water supplies. There is no need to use welding equipment. All you need is to have pruning shears and a set of wrenches.

Installation of polypropylene pipes using compression fittings is carried out as follows (Fig. 2):

a crimp nut is installed at the end of the pipe;
a split-type ring is installed on top of the nut so that its edge is at a distance of 1 mm relative to the pipe cut;
the plastic pipe is put on all the way and secured to the fitting;
The crimp nut is installed using wrenches.

Figure 4. The welding machine has sleeve-shaped nozzles for heating the outer surface of the pipe and a mandrel for heating the inner surface.

Flange connections are used for polypropylene products with a large cross-section. Such a connection allows, if necessary, to easily disassemble any section of the pipeline and eliminate any malfunctions that have arisen (Fig. 3). Also quite often, flange joints are used for mounting plastic products with metal ones.

Installation of flanges is quick and easy. First, the end of the pipe is cut straight, after which a flange and rubber gasket are put on it. The same operation is performed with the other end of the pipe. After this, both flanges are connected to each other using bolts.

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Welding connection of polypropylene pipes

For welding products with a cross-section up to 6.3 cm, the predominant type is sleeve or socket welding. In this case, the joining of pipes is carried out using the 3rd part - the coupling.

To connect polypropylene pipes with a diameter of more than 6.3 cm, it is recommended to use the butt welding method.

Compared to metal and metal-plastic pipes polypropylene analogues are cheaper, more durable and reliable. Another important argument in their favor is the ease of connection and sealing of joints, which has a positive effect on the viability of the entire pipeline system.

What parts do polypropylene products fit into?

If you don’t know how to connect polypropylene pipes, our explanations will come in handy. This type of pipe is in demand when preparing water supply, heating and irrigation mains. Due to the long service life of polypropylene pipes in the water supply network, which is about half a century, this type is increasingly preferred as a replacement for worn lines. And also these pipes are perfectly combined with auxiliary elements made of steel and polyethylene.

All polypropylene pipes, according to the scope of application, are classified into types:

Conventional pipes for installation of pipelines with cold water(PN 10, 16).
Universal thick-walled pipes for carrying heating system, withstanding hot water with a temperature of +80ºC (PN 20).
Composite pipes having a layer of metal or nylon that is peeled off during soldering. Used for installation of heating systems where the maximum temperature hot water can reach +95ºC (PN 25).

Polypropylene pipe connections are distinguished by the absence of seams between the components of the pipeline.

If their diameter is less than 50 millimeters, you can use all kinds of fittings:

couplings for connecting sections of the same transverse size;
crosses to form branches;
plugs for sealing the ends of the pipe;
adapters for joining pipe products of various diameters;
union fittings for connecting pipes with flexible hoses.

Pipe soldering

Let's consider connecting pipes using the soldering method:

Using a hacksaw or sharp scissors that do not deform the plastic, cut the pipes at an angle of 90°. If you don't know how to cut a pipe at an angle, you need to read more information.
If there are burrs on the end, carefully clean them off.
Mark the depth of the soldering, i.e. measure a section of a certain length on the pipe to fit into the coupling or tee and draw a line with a marker. Remember that the length of immersion into the connecting element is directly dependent on the diameter of the products. The larger the pipes, the greater the soldering depth.

The algorithm of actions will change slightly if the pipes are reinforced. Then before the soldering process you need to treat upper layer tubular product, including aluminum foil, basalt or nylon fiber. Using a special tool, the required layer size can be easily removed. Need to pay Special attention to carefully remove the foil. Even a slight excess of it on the pipe will negatively affect the tightness of the solder joint.

Further steps in the soldering process:

Place a soldering iron with nozzles that are pre-selected according to the diameter of the pipes on a smooth and reliable surface.
At the same time, a pipe and fitting are placed on the hot nozzle on both sides, moving it to the marking made with a marker.
Heat the plastic for a certain time, which depends on the diametrical size of the pipes. For example, if the value cross section the product is 20 mm, then 6 seconds are enough to warm up; if 32 mm - 8 sec.
Then the elements are removed from the nozzle and ensure a strong fixation into each other. Never make any turning movements.
To ensure strong adhesion of the joint, you need to wait 4-10 seconds. This time will be enough for the polypropylene to harden properly and obtain a permanent connection.

Please note that it is very important to adhere to the required heating time. If heating is insufficient, leaks may form. Excessive overheating will lead to sealing of the space inside the pipe and the occurrence of meltdown. You shouldn’t delete it right away, because... heated plastic will begin to deform even more. It is better to wait until the product has completely cooled down and then remove the excess.

Before you begin the process of soldering pipes, it is better to perform a couple of practice joints. It is easier to work with small joints by installing the welding machine directly on the table. This way you can check how correctly the pipe soldering is performed.

But attaching elements to a partially finished pipeline will be more difficult:

Place a soldering iron nozzle on the polypropylene pipe, insert a tee into the other part, holding welding machine Aweigh.
When preparing the main water supply, it is necessary to alternate subsequent connections. In hard-to-reach areas, it is better to avoid joining work due to the difficulty of using a soldering iron.
The material must be dry and clean, because the presence of dirt and water will reduce the quality of the joint. It is known that the material, if wet, can deform when heated.
Purchase all products (pipes, fittings) from one manufacturer, because chemical composition elements from different manufacturers may differ, which will ultimately lead to a leaky connection.
Temperature in the room where work with polypropylene is carried out, it should be optimal and not lower than +5̊C.

Connecting pipes using the crimp method

Often, repairs will require disassembling the pipeline. If the connection of the main components is made by soldering, which is reliable and durable, then disassembling it is almost impossible. Let's look at how to connect polypropylene pipes without a soldering iron, which cannot always be bought or rented from friends. In this case, you will need threaded fittings with a pressure ring, which are called collet fittings (crimp). And for good reason, because this kind of connection can withstand loads of up to 16 atmospheres.

In order to connect the pipeline components together using the crimping method, additional parts will be needed:

tees;
soldered and combined couplings with internal and external threads;
squares;
adapters with external thread;
plugs;
Ball Valves;
tees with union nut;
all kinds of threaded fittings;
sealing rings for socket joints of polypropylene pipes, etc.

You need to pay attention to one nuance: to ensure reliable tightness, all seals and joints are generously treated with silicone.

Further actions:

Cut off part of the polypropylene pipe.
Insert it securely into the fitting.
Wrap the threads of the part with thread to seal.
Pull the ferrule and nut on top.
Use a crimp wrench, which you need to take care of in advance, to completely tighten the pipe elements.

Compared to welding, this method takes much more time, but it is very convenient for connecting polypropylene pipes and radiators.

Docking combination of metal and polypropylene

When installing plumbing and heating systems, there are places where it is necessary to connect steel and plastic pipes. For such cases, you will need special adapter fittings, which have a smooth hole for a plastic pipe on one side, and a threaded metal insert on the other. Therefore, the polypropylene pipe is joined by welding, and the steel pipe is tightened with a crimp wrench. As a result, the resulting connection is inferior in strength to a welded one, but will still last for many years.

Please note that upon completion of installation work, it is necessary to conduct a test run of water in the system. This way you can check the tightness of the joints of pipes and pipeline components. Possible leakage threaded connections, which must be immediately tightened with a wrench.

As we see, it is possible to carry out self-installation plumbing or heating system made of polypropylene pipes. The main thing is to impeccably comply with the requirements of the instructions for using the welding machine and the installation technology. Watching a video on this topic will be very useful.

Compound of polyethylene and polypropylene

This option of the line involves the purchase of special fittings. They will be needed if water enters the building through HDPE pipes and is subsequently diluted using polypropylene pipes. In such cases, soldering of HDPE pipes with a soldering iron for polypropylene is quite often carried out, which is quite acceptable.

Let's consider two cases of how to connect polypropylene pipes without welding with polyethylene pipes:

A threaded coupling is attached to the HDPE product, on one side of which there is a clamp connection. A similar threaded coupling is also mounted on the end of the polypropylene pipe, with a solder joint on one end and a threaded joint on the opposite end. To avoid leaks and achieve high-quality joining, tow or FUM tape is applied to the threads.
Using a flange connection. The rubber seal is located between the flanges, which are bolted together. Read also: "".

Polypropylene pipes have long gained great popularity among consumers. Unlike metal options polypropylene pipes are much lighter in weight, and methods for connecting this type of communications do not require skills in working with a welding machine and metal-cutting tools, as is the case with iron pipes.

Peculiarities

As with any other type plumbing communications, installation of polypropylene pipes has a number of features.

When butt welding, the walls should not be thicker than 4 mm. The joining surfaces must be trimmed, and strict parallelism of the connected elements must be maintained. When docking, it is recommended to use special guides.
Since threading cannot be done on a polypropylene pipe, threaded fittings are used for threaded connections, and a sealant and Teflon tape are used to seal the connection.
When welding polypropylene pipes, it is necessary to ventilate the room. At negative temperature This type of work cannot be carried out indoors, since joining when the elements are insufficiently heated does not guarantee the tightness of the connection.

At welding work with polypropylene pipes, you need to heat the soldering iron to desired temperature and place it on the stand. When working, you should follow safety precautions, as we're talking about about a high temperature of 260 C.

To ensure a high-quality connection of elements, it is necessary to maintain the melting time required for a certain pipe diameter.

Below are the diameters and time intervals.

16 mm – 5 sec;
20 mm – 6 sec;
25 mm – 7 sec;
32 mm – 8 sec;
40 mm – 12 sec;
50 mm – 24 sec;
63 mm – 40 sec.

What is necessary?

To install polypropylene pipes you will need special tools for cutting and joining elements.

The list of tools includes devices such as:

pipe cutter;
welding machine;
stripping;
glue gun;
marker for marking;
connecting part and tape measure.

Pipe cutter for polypropylene pipes it is better to use a professional one - such a tool guarantees reliability and ideal straight cut, it will prevent the formation of burrs on the cut surface. When choosing a pipe cutter, you should consider the following: important parameter, as minimum and maximum diameter pipes. You should choose a tool with a blade made of alloy steel only.

Welding machine manual type must have a thermostat and a heating plate with holes for installing nozzles. The welding machine requires a pair of Teflon-coated nozzles. It should be chosen from well-known brands that have proven themselves in the market, since tools from dubious manufacturers may fail during operation, which will stop all work.

Stripping can be done manually or in the form of an attachment to a drill.

To strip the outer layer, couplings with internal knives (shavers) are used. Select the required coupling for the diameter of the pipe being cleaned. They also use double-sided couplings that allow you to work with different diameters. To strip the inner layer of the pipe, use a trimmer with knives located inside. The pipe is inserted into the tool and rotated several times.
Strippers in the form of attachments on a drill differ from manual options only by the presence of a rod that is inserted into the tool chuck.

Glue gun can be used as alternative option other types of connections. This tool has two advantages: glued seams are almost as reliable as welded and other joints, and the glue sets quickly. Such connectors perfectly fasten shaped parts and other elements.

Methods

There are several ways to connect polypropylene communications. Choosing which method to use depends on the type of PP pipes and their purpose.

Cold welding is based on gluing elements with a special adhesive composition. It is applied to the parts that need to be connected. First, the surfaces to be bonded must be degreased. After applying the glue, wait a while and connect the pipe to the necessary element. After a short period of time (approximately 20 minutes), the connection will stabilize and be reliable.

Connection using steel or cast iron fittings. This method is suitable for pipelines with a small diameter. Typically, fittings are installed on bends and branches of communications. The fitting includes elements such as a cover, a sleeve and a clamping ring, which is located in the socket of the product. The pipe is fixed using the seam ring included in the fitting design.

When connecting fittings, you must observe step by step plan actions:

the pipe cut must be made at a right angle;
it is necessary to remove all burrs on the surface to be joined;
then you need to install the nut from the fitting onto the pipe and put the clamping ring on it;
After this, you need to insert the pipe into the fitting and secure the connection with a clamping ring and nut.

Connections using flanges are considered very reliable and can withstand high temperatures and high pressures. This method is used when it is necessary to connect polypropylene pipes without resorting to welding. For connection, bolts are used that are screwed into the flange thread.

When connecting with flanges, the following installation rules must be observed:

at the pipe connection it is necessary to make a cut, avoiding the appearance of burrs;
the gasket that is installed on the cut must have a protrusion of 15 cm;
a gasket is placed on the flange and connected to another flange installed on another pipe to be connected;
The gaskets must be installed in such a way that their cross-section does not touch the bolts;
More than one gasket cannot be installed on a flange, as this will reduce the tightness.

Connection using couplings. To connect with couplings, you need to make a thread on the pipes for their subsequent installation and, to make the connection tight, wrap a little tow around it. The edges to be joined should be cut evenly and the location of the coupling should be marked with a marker. Then you need to apply lubricant to the coupling and install it on the pipe in the previously marked place.

Welding refers to the hot joining method. This type of connection is one of the most reliable, and its essence lies in the melting of polypropylene with a special apparatus under the influence of a temperature of 260 C. The elements heated to the required temperature are pressed tightly against each other, and after they cool, a reliable connection is formed. The time after joining until the final polymerization of polypropylene will take 20 minutes.

Before proceeding with the connection by welding, it is necessary to remove all irregularities and burrs, and if the pipe has a layer of foil, then it must be treated with a trimmer.

When connecting by welding, the following sequence of actions should be observed:

turn on the welding machine and heat it to a temperature of 260 C;
you need to put the device nozzles on the propylene pipes to be connected - this needs to be done very quickly;
when the elements to be welded begin to melt, they are removed from the apparatus;
connect the molten elements to each other by pressing firmly for 15 seconds;
The connected elements must be allowed to polymerize to fully set - this usually takes about 20 seconds.

Common mistakes when connecting by welding:

displacement of elements during welding at the moment of their heating;
when joining elements, they cannot be rotated - otherwise the seam will be unreliable;
When welding the valves, the location of the valves was not taken into account, and they cannot move freely.

HDPE or PVC pipe can be connected by soldering. This is especially true for polyethylene construction.

How to connect?

In the case when you need to connect a polypropylene pipe to a metal one, you can use the threaded connection method. To do this, you will need special fittings, one end of which is smooth, and the other has a thread for metal pipe. With this type of connection, the pipe diameter should not be more than 40 mm.

The thread on the fitting can be either external or internal. A smooth surface on the reverse side is needed for welding plastic pipe. For tightness, linen tow impregnated with drying oil is mainly used.

The tow should be applied to a maximum of two turns and in the direction of the thread.

Sequence of actions for the threaded installation method:

the pipe is cut at a right angle, its end is lubricated with grease, and then a thread is applied using a thread-cutting tool;
remove all shavings from the thread and seal the joint with tow;
a fitting is screwed onto the pipe thread;
the opposite smooth end of the coupling is welded to the polypropylene pipe.

Polypropylene pipes can be connected either by welding or cold. Greater preference is given to the first option, since it is considered the most reliable and durable.

Welded joint

Before welding, polypropylene pipes and fittings for them must be treated with a degreasing solution, and then allowed to dry - only after this procedure can you proceed directly to welding. Similar preparatory work necessary for any type of PP pipes with the exception of those reinforced with foil. U reinforced pipe The cut is cleaned using a special cleaning tool (shaver), into which the desired end of the pipe is inserted and turned several times. After stripping top part The pipes need to be degreased.

You must mark the pipe with a marker, marking the required distance to press it into the fitting. Then the end of the pipe must be placed on the mandrel and the fitting must be inserted into the sleeve of the welding machine. All actions should be done very quickly and clearly. After this, the connected elements are heated for a strictly allotted time.

After the elements to be welded have melted, they must be removed from the nozzles and the pipe quickly pressed into the fitting. The connection requires some force, since the elements to be welded must be pressed tightly and held in this position for some time. You should not clamp the joining elements for more than 20 seconds, since this time is quite enough for them to set firmly. After connecting, be sure to let it cool for a few minutes.

Modern technologies make it possible to create reliable and durable communications using polypropylene pipes. They are not subject to corrosion. Therefore they are widely used. But in this case important point is to connect polypropylene pipes with your own hands. This can be done by soldering or using a method without welding. Therefore, it is not necessary to involve a specialist. Let's look at each in more detail.

We connect with welding

Tool

To obtain best result and not to provoke problems during operation, you should thoroughly study the technology and existing rules. Only after this can you begin the soldering process.

And for this process you will need a welding machine, which experts often call an “iron.” This device is a simple device that runs on electricity. It often comes with attachments different diameters with instructions.

Soldering technology

Despite their “polypropylene” nature, such pipes are perfectly used for hot water supply or heating. They will last a very long time.

The connection of such products occurs when exposed to high temperature at their ends. But there is one subtlety here. The pipes are heated from the outside, and the connection elements from the inside. This is the only way to get strong knots.

Step by step process:

First, the soldering iron is turned on, it should be heated to 270 degrees. The products are cut into the required pieces and cleaned. You can make convenient notes to understand what depth to immerse them in the heating apparatus.
We evenly insert the pipes and connection elements onto the nozzles of the device. This is also important for quality soldering.
After the element and pipe have melted, they are removed from the device and connected to each other. The evenness of the soldering is also important here. You need to press down lightly, but do not scroll around the axis. Pressure also affects the quality of soldering.
After joining the elements, they need to be held motionless for several minutes.

When performing manipulations, you should pay attention to another important nuance. The inner surface of the seams should not lose permeability. After all, when melted, a small bump appears, which is dangerous if the product is of small diameter.

Heavy influx of material caused by excessive heating should also be avoided. To check the permeability of the pipe, you can blow it out and run water through it.

It is recommended that if you do not have soldering experience, you can first practice before starting to perform basic manipulations. And therefore, it is recommended to purchase materials with a reserve, because in addition to training, defects can certainly occur during the main work. It is highly undesirable to run or go to the store again while soldering is in progress. For more information regarding DIY soldering, you can also watch a video on the topic.

As for the device itself, it is not necessary to buy it. The device can be rented from someone.

We connect without welding

There is another method that allows you not to use welding - “cold”. In this case, use compression fittings. Therefore, there is no need to buy or rent welding equipment. All you need is a crimp wrench. This tool is often sold with fittings.

Conclusion

In short, there is nothing scary or very difficult about connecting polypropylene pipes with your own hands. As with most technologies, it requires clear and correct execution established technological standards. To do this, you can additionally familiarize yourself with video materials. Then the process will be completed not only quickly, but also efficiently. And this is already a guarantee of the durability and reliability of the resulting water supply or heating system.

It is not necessary to use welding. After all, you can get by alternative way. However, the disadvantage of this solution will be the increase in time of all work. Therefore, it is necessary to choose a method taking this point into account. Then everything will go smoothly, and the constructed system will gain the required strength and reliability.

(PP), gradually replaced traditional metal ones not only in water supply systems, but also in heating. Ease of installation plays an important role in its growing popularity - it is quite easy to install polypropylene pipes with your own hands, even in the absence of special skills and knowledge.

Positive qualities of PP pipes

Such pipes have the following advantages:

Attention! In most cases, extremely permissible temperature working fluid is 90ᵒC (this includes products of the “twentieth” and “twenty-first” brands). When supplying cold water, where the temperature often does not exceed 20ᵒC, pipes from “eleventh” to “sixteenth” grades are used.

Important installation details

The connection of PP pipes is carried out using threaded/non-threaded fittings. In turn, threaded products can be:

one-piece;
detachable.

It is worth noting that installation is primarily affected by operating conditions.

After familiarizing yourself with all necessary information you can start working.

Stage one. Drafting

Installation work should begin with drawing up a project for the future highway. An important criterion At the same time, ergonomics are important, as a result of which the number of turns and connecting elements should be minimal.

When arranging a heating system, a well-designed project is especially important, in which you should indicate the location of such elements as:

couplings;
adapters;
fasteners;
corners;
heating equipment.

The line is connected to the radiators in a one- or two-pipe way, from the side or from the bottom.

Attention! An equally important point when designing is the possible thermal expansion of polypropylene - this should also be taken into account.

Plumbing

Here the highway connects to centralized system for the purpose of supplying water to the necessary plumbing fixtures - toilet, sinks, boiler, etc. There are two ways to do the wiring.

Method number 1. Open option. Horizontal pipes are installed slightly above floor level, and vertical pipes are installed exclusively in the corners. All this allows you to make the pipeline less noticeable.

Method No. 2. Closed option. Extremely difficult to implement because it involves preliminary conduct maximum accurate calculations. Pipes (necessarily solid) are walled up in the walls, and there must be free access to each joint.

In addition, the water supply layout can be:

sequential type (the most budget-friendly and easiest-to-implement option);
collector type (a collector is used when supplying water);
with pass-through sockets (not very popular).

Stage two. Welding of polypropylene pipes

This procedure will require electric jigsaw(cutting polypropylene) and special welding equipment.

Attention! Before starting work, sleeves (nozzles) of the required diameter are put on. Next, using the thermostat, the appropriate temperature is set (about 260-265ᵒC), after which the device warms up (you can find out about the heating time from the manufacturer’s instructions).

Step one. While the device is warming up, necessary measurements, pipes are marked and cut.

Step two. The ends of the products that are planned to be connected to each other are thoroughly cleaned and degreased.

Step three. Using a pencil, mark the depth of insertion of each product into the sleeve. It is typical that at least a millimeter gap should remain, so the pipes do not rest against the fitting coupling.

Step four. The PP pipe with fitting is put on the sleeve in accordance with the marks made, and heating of all elements must occur simultaneously.

Attention! If the fitting is bad (or vice versa - too loose) of one of the elements, it is immediately rejected.

The heating duration depends not only on the diameter of the products, but also on the depth of welding (this can be found in the table below).

Step five. After a certain period of time, the products are removed and connected, pressing onto each other with little effort. It is prohibited to rotate the elements along the center line.

Step six. Within a few seconds after the connection, an initial adjustment is made, then the elements are finally fixed.

Attention! The assembly sequence is determined in advance.

If there are no gaps left at the connection point, then it (the connection) can be considered high quality.

Video - Welding PP pipes

Manufacturing of welding machine

Due to the fact that a more or less good one costs over a thousand rubles, it is cheaper to rent it or make it yourself. If the latter was chosen, then for work you should prepare:

The sequence of actions should be as follows.

Step one. In order to improve heat transfer, the sole of the iron is treated with thermal paste, then a Teflon sleeve is fixed. The location of the latter is determined in advance - the wide part up or down.

Step two. The sharp “nose” is filed off for more comfortable work near the walls.

Step three. The iron is heated until the device turns off a second time.

Step four. It’s good if the iron is equipped with a temperature sensor - this will allow you to accurately determine the heating temperature. But there is an easier way - through lead. This metal melts at 230ᵒC and above, which approximately coincides with the temperature required for welding.

The further technology is identical to that described above.

Stage three. Pipeline installation

When laying the highway you will need:

pipes;
tees;
Ball Valves;
plugs;
adapters;
bends;
couplings;
detachable connecting elements;
threaded fittings;
plastic clamps.

First of all, the installation of the main elements of the system (plumbing, radiators, boilers, etc.) is carried out, after which the future highway is marked in accordance with the drawn up project. Pipeline elements are connected to each other using couplings.

Attention! Hard-to-reach areas of the system are assembled separately.

When it comes to heating or hot water supply, thermal expansion is taken into account. To compensate for the latter, it is advisable to use movable connections. When installing a closed pipeline, the walls are first grooved (a groove with a width of two pipe diameters is made in appropriate places).

Filling the pipeline with liquid is permissible only after one hour from the end of installation. Hydraulic testing can be carried out only after 24 hours.

Sewage system made of PP pipes

As noted earlier, polypropylene pipes are now actively used in the construction of buildings. The installation procedure in this case has its own nuances.

Internal sewerage

There are a number of rules that must be followed when installing sewerage in the house.

The pipeline is laid at an angle in the direction sewer riser(about 3 cm per linear meter).
If the room is not heated, then the pipes are additionally insulated with mineral wool.
You cannot make sharp turns at an angle of 90ᵒ; instead, so-called half-bends are used.
Fan-type ventilation is a mandatory component of the sewer system, which will prevent penetration unpleasant odor in the home.
The toilet is connected only after the sink, otherwise the water seal will break.

External sewerage

Step one. The diameter of the pipes is determined, depending mainly on the number of people living in the house.

Step two. A trench is dug from the sewer riser to the septic tank or cesspool. In this case, a slope is maintained depending on the soil freezing line, or the pipeline is insulated with mineral wool.

Step three. The bottom is covered with a “cushion” of sand. Its thickness should be at least 20 cm.

Step four. The pipeline is being laid. It is important to avoid possible sagging, otherwise the connections will soon collapse.

Attention! The seams do not need to be sealed, since PP pipes for external use already have rubber seals.

Horizontal drilling of a trench for a pipeline is carried out using special equipment with pressure-action pump jacks. Drilling occurs using a steel cone-shaped tip. A similar technology is used in construction:

auto and railway roads;
pipelines to basements;
highways to working wells.

Installing a PP pipeline with your own hands will help you save a lot, but only if done correctly.